Booster dose

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Science and technology

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What Wikipedia says

A booster dose is an extra administration of a vaccine after an earlier (primer) dose. After initial immunization, a booster provides a re-exposure to the immunizing antigen. It is intended to increase immunity against that antigen back to protective levels after memory against that antigen has declined through time.

Excerpt from the Wikipedia article “Booster dose”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Government of Indonesia, Public domain, via Wikimedia Commons.